SLIDE 1
11-16-2018
- T. A. Mohayai
GOAT Update Tanaz Angelina Mohayai, for the GOAT team November 16, - - PowerPoint PPT Presentation
GOAT Update Tanaz Angelina Mohayai, for the GOAT team November 16, - - PowerPoint PPT Presentation
GOAT Update Tanaz Angelina Mohayai, for the GOAT team November 16, 2018 HPgTPC Meeting Purpose Reuse ALICE TPC Inner and Outer Readout Chambers ( IROC and ALICE TPC OROC ) for DUNE near detector high OROC pressure gaseous Argon (ND HP IROC
SLIDE 2
SLIDE 3
11-16-2018
- T. A. Mohayai
3
Purpose
Reuse ALICE TPC Inner and Outer Readout Chambers (IROC and OROC) for DUNE near detector high pressure gaseous Argon (ND HP GAr) TPC: ALICE: operated @ 1 atm with Ne- CO2-N2 gas mixture IROC/OROC ALICE TPC IROC OROC DUNE HP GAr TPC: will operate @ 10 atm with Ar-? gas mixture ALICE frontend electronics will not be provided
SLIDE 4
11-16-2018
- T. A. Mohayai
4
GOAT Test Stand
Gaseous-Argon Operation of the ALICE TPC, GOAT Test ALICE readout chambers at 10 atm and in Ar-? gas mixture (currently 90-10 Ar-CO2) Develop front-end electronics Main components: Drift: field cage Signal readout: ALICE IROC Front-end: preamps and CAEN digitizers
50 cm
IROC Field Cage Ortec preamp
SLIDE 5
11-16-2018
- T. A. Mohayai
5
GOAT Test Stand
50 cm
IROC Field Cage
New Solution
Gaseous-Argon Operation of the ALICE TPC, GOAT Test ALICE readout chambers at 10 atm and in Ar-? gas mixture (currently 90-10 Ar-CO2) Develop front-end electronics Main components: Drift: field cage Signal readout: ALICE IROC Front-end: preamps and CAEN digitizers
SLIDE 6
11-16-2018
- T. A. Mohayai
6
PASA: an Intermediate Preamplifier Solution for GOAT
Vout
+
Vout
- Pre-Amplifier Shaping Amplifier, PASA:
Intermediate solution before new ideas 16-channel charge sensitive shaping amplifier Differential output – further upgrade to readout system required (a next step) 40-pads connection for readout with a single Ortec channel 16-channel PASA
SLIDE 7
11-16-2018
- T. A. Mohayai
7
Previously on PASA
First attempt: Directly connected PASA to chamber (with original 40-pad setup) Led to disagreement between resulting signal and PASA response function IROC Signal Readout with PASA G4 function after output subtraction Difgerential Output Expected PASA Response Function
SLIDE 8
11-16-2018
- T. A. Mohayai
8
PASA Response to a Function Generator
Input signal: a 4 mV single pulse charging up a 2 pF capacitor Output signal from PASA: agrees with the expected
190 ns FWHM 4mV input signal x 2pF capacitor = 8fC
- r 50k electrons, with 95mV
amplitude/8fC = 11.8mV/fC gain (close to 12.75mV/fC conversion gain of PASA)
SLIDE 9
11-16-2018
- T. A. Mohayai
9
Summary and Next Steps
Using a function generator, the PASA response function agrees with the expected G4 distribution Further studies are underway to suppress the noise in the PASA board (current signal-to-noise ratio 10:1) Next steps: Develop new front-end scheme where PASA differential
- utput is converted to a single output for input into CAEN